package com.itzhigui.interceptor;

import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.auth0.jwt.interfaces.DecodedJWT;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.itzhigui.utils.JWTUtil;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

/**
 * @author java1412
 * @since 2023-11-13 17:40:24
 */
public class JWTInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Map<String, Object> map = new HashMap<>();
        // 从请求头中获取token
        String token = request.getHeader("token");
        try {
            DecodedJWT decodedJWT = JWTUtil.verify(token);
            return true; // 放行
        } catch (SignatureVerificationException e) {
            e.printStackTrace();
            map.put("msg", "无效签名!");
        } catch (TokenExpiredException e) {
            e.printStackTrace();
            map.put("msg", "token过期!");
        } catch (AlgorithmMismatchException e) {
            e.printStackTrace();
            map.put("msg", "token算法不一致!");
        } catch (Exception e) {
            e.printStackTrace();
            map.put("msg", "token无效");
        }
        map.put("state", false);
        // 将map转成json
        String json = new ObjectMapper().writeValueAsString(map);
        response.setContentType("text/html;charset=UTF-8");
        response.getWriter().write(json);
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    }
}
